Kentrosaurus (KEN-troh-Saw-rus) was a small member of the stegosaur family. It had 9 pairs of plates on its neck, shoulders, and back, and 5 pairs of long, sharp spikes above its hips and along its tail. Kentrosaurus also had a long spike on each of its hips (some paleontologists think that it also had these spikes on its shoulders).[1]

Two composite skeletons of Kentrosaurus were assembled from hundreds of bones quarried by German paleontologists between 1909 and 1912 in Tanzania. It was named by Edwin Hennig in 1915. The Tanzanian quarry geology indicated Kentrosaurus lived near a large river. It is therefore thought that it fed on lush, low growing vegetation along the riverbank. So many Kentrosaurus bones were found in this quarry that scientists believe that at least 70 must have perished at the site. This also suggests that Kentrosaurus lived in herds.[1]

Kentrosaurus was found in the same quarry as the famous Berlin Brachiosaurus. Unfortunately one of the two existing Kentrosaurus skeletons was destroyed by an Allied bombing raid on Berlin during World War II.[1]

Wikipedia has a more detailed and comprehensive article on Kentrosaurus

Kentrosaurus was featured in the videogame Jurassic Park: Operation Genesis as a two-star small herbivore. They live in scrub grasslands. They are shy and are especially scared of Sauropods and Hadrosaurs. They are, however, are friends of Stegosaurus and like to move in herds with them. Kentrosaurus will live until 3 years when their DNA is up to 100%.

Their tail spike attacks don't do as much damage to a predator as much as the larger Stegosaurus. It is the only small herbivores that are brave enough to attack large carnivores.

Kentrosaurus appears in the game. It is a legendary tournament herbivore. The only way to get the Kentrosaurus so far is to buy the Earth WWF pack that costs $49.99 USD. Along with Pachyrhinosaurus, they are the only tournament dinosaurs that do not yet have a tournament to fight in and they can only be collected by buying the Earth WWF pack.